Definition of ionization potential in English:

ionization potential

noun

Physics
  • The energy required to remove an electron from an atom or molecule of a gas to an indefinite distance; the potential difference through which an electron must be accelerated to achieve this; specifically (more fully "first ionization potential") the energy required to remove an electron in the lowest energy state (the least strongly bound electron).

Origin

Early 20th century; earliest use found in Proceedings of the Royal Society of London.